textarea word not appearing in the url through AJAX

[gilgalbiblewhee]

I used AJAX in this link:
http://www.iusedtoloveher.com/wheelofgod/

You have to go open the navigation box on the top left (sorry I have to simplify this in the future!) and then click the third link Compare Two Bible Texts. Once you enter a word in the first textarea and select the book, chapter, and verse it doesn't record it in the textbox underneath the verse dropdown select.

Anything wrong with this AJAX code?

function fillText1(){
  var req = createRequest();
  if(req){
    req.onreadystatechange = function(){
      var c = document.getElementById('seltext1');
      if(req.readyState){
	if(req.readyState == 4){
	  if(req.status == 200){
	    c.innerHTML = req.responseText;
	  }
	}
      }
    }
    var bobj = document.getElementById('selbook1');
    //var book = bobj.options[bobj.selectedIndex].value;
	var book = bobj.value;
    var cobj = document.getElementById('selchapter1');
    //var chapter = cobj.options[cobj.selectedIndex].value;
	var chapter = cobj.value;
    var vobj = document.getElementById('selverse1');
    //var verse = vobj.options[vobj.selectedIndex].value;
	var verse = vobj.value;
    var getFullURL = 'twotexts/getText1.php?book='+book+'&chapter='+chapter+'&verse='+verse;
    for(i=0;i<5;i++){
		//if(key.value!=0){
        getFullURL = getFullURL + '&keyword' + i + '=' + document.getElementById('keyword'+i).innerHTML;
		//}
    }
	//document.write(getFullURL);			
    req.open('GET',getFullURL,true);
    req.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
    req.send(null);
  }
}